Everyone is turning me in to a skeptic now, doubting my own sanity…
The only other explanation, the only one, is that I heard the drones coming, was scanning for them, and filmed the wrong target. As I mentioned, these were probably 4-500’ up, and I confess to not having my glasses on, but even with the naked eye (and raw video) I did not see flapping wings, just the same erratic behavior that I saw in the first two groups of 2 and 3, which were at about 100’ agl, directly beside me, very clearly small quadcopters, no mistaking that.
I’ll capitulate to the naysayers, but that doesn’t change my overall experience of seeing small drones flying in a tight, erratic formation coming from immediately adjacent land that is unoccupied for a thousand square miles.